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Cygnus A (3C 405)

Cygnus A (3C405)
Cygnus A (3C 405) 4.8 GHz VLA map courtesy of C. Carilli
The strongest extragalactic radio source and third strongest radio source in the sky (after the Sun and Cassiopeiae A). At one time believed to be the result of a collision of two galaxies, it has now been identified as a classic double-lobed radio galaxy that, at optical wavelengths, is a 15th magnitude cD galaxy (a supergiant elliptical) lying about one billion light-years away in the constellation Cygnus.

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